Class II locations.

Class II locations. Class II locations are those that are hazardous because of the presence of combustible dust. Class II locations include the following:
(1) Class II, Division 1. A Class II, Division 1 location is a location:
(i) In which combustible dust is or may be in suspension in the air under normal operating conditions, in quantities sufficient to produce explosive or ignitable mixtures; or
(ii) Where mechanical failure or abnormal operation of machinery or equipment might cause such explosive or ignitable mixtures to be produced, and might also provide a source of ignition through simultaneous failure of electric equipment, through operation of protection devices, or from other causes; or
(iii) In which combustible dusts of an electrically conductive nature may be present.

Source

29 CFR § 1910.399

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Scoping language

Acceptable. An installation or equipment is acceptable to the Assistant Secretary of Labor, and approved within the meaning of this subpart S:

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